Hello,

I'm sorry to hear that you're experiencing issues with Firefox on Windows 11. As a Firefox support volunteer, I'm here to help you find a solution.

Based on the information you provided, it seems that you're encountering a problem where Firefox crashes upon startup and a notice appears stating, "Der Tab ist gerade abgestürzt" (The tab has just crashed). Even after a fresh installation, the issue persists.

Here are some troubleshooting steps you can try to resolve this problem:

Clear Firefox Cache: Clearing the browser cache can help resolve various issues. To do this, click on the menu button (three horizontal lines) in the top-right corner, go to Options or Preferences, select Privacy & Security, scroll down to the Cookies and Site Data section, and click on Clear Data. Make sure to select both "Cookies and Site Data" and "Cached Web Content" options.

Start Firefox in Safe Mode: Starting Firefox in Safe Mode can help identify if the issue is caused by an add-on or theme. To do this, click on the menu button, go to Help, and select Restart with Add-ons Disabled. If Firefox starts without any issues in Safe Mode, it indicates that an add-on or theme is causing the problem. You can then disable or remove the problematic add-on or switch to a default theme.

Create a New Firefox Profile: Sometimes, issues can be related to a corrupted user profile. Creating a new profile can help resolve such problems. To create a new profile, close Firefox, press the Windows key + R to open the Run dialog, type "firefox.exe --profilemanager" (without quotes), and press Enter. In the Profile Manager window, click on Create Profile and follow the prompts to set up a new profile. Then, start Firefox with the new profile and see if the issue persists.

If none of the above steps resolve the problem, please provide more details about any error messages or specific actions that trigger the crash. Additionally, let me know if you have any specific extensions or settings enabled that could potentially be causing the issue.

I hope these suggestions help in resolving the problem you're facing. If you have any further questions or need additional assistance, please don't hesitate to ask.

Try to start Firefox in Troubleshoot Mode to see if that works.

• Windows: hold down the Shift key while starting Firefox
• Mac: hold down the Options key while starting Firefox

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode

Try to start Firefox with the about:blank page by creating a copy of the current Firefox desktop shortcut. Add a space and -url "about:blank" to the target field in the Properties.